4 1 -3 -4 | What is the next number in the sequence 4 1 -3 -4 ?

Find the next number that fits the pattern:

4, 1, -3, -4, ?

-1

Explanation:

s(n) = s(n-1) - s(n-2)
1 - 4 = -3
-3 - 1 = -4
-4 - (-3) = -1

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